Dense jungles can be quite dark, so I also think that the current "darkness" fits as well.

And then you could use slightly yellowish, or simply white, lightbulbs and downward spotlights where the opening in the foliage is. Thus creating a bit more contrast, making the lighting more interesting.

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If it walks like a duck and if it quacks like a duck, it is a duck.

While I do prefer the slightly higher ceiling, I think it definitely needs the original rock textures on it. You can leave a bit of green on the side though, but it was better without this squared leaves surface